Incorporation of manganese dioxide within ultraporous activated graphene for high-performance electrochemical capacitors

ACS Nano
Xin ZhaoRodney S Ruoff

Abstract

Manganese dioxide (MnO(2)) particles 2-3 nm in size were deposited onto a porous "activated microwave expanded graphite oxide" (aMEGO) carbon scaffold via a self-controlled redox process. Symmetric electrochemical capacitors were fabricated that yielded a specific capacitance of 256 F/g (volumetric: 640 F/cm(3)) and a capacitance retention of 87.7% after 1000 cycles in 1 M H(2)SO(4); when normalized to MnO(2), the specific capacitance was 850 F/g. Asymmetric electrochemical capacitors were also fabricated with aMEGO/MnO(2) as the positive electrode and aMEGO as the negative electrode and had a power density of 32.3 kW/kg (for an energy density of 20.8 Wh/kg), an energy density of 24.3 Wh/kg (for a power density of 24.5 kW/kg), and a capacitance retention of 80.5% over 5000 cycles.

References

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May 14, 2011·Science·Yanwu ZhuRodney S Ruoff

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Citations

Jul 16, 2013·ACS Applied Materials & Interfaces·Zhibin LeiX S Zhao
Jan 13, 2015·ACS Applied Materials & Interfaces·Huanlei WangXin Wang
Jun 5, 2014·Chemical Reviews·Adriano AmbrosiMartin Pumera
Nov 27, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Xiaoting ZhengXiaojun Zhang
May 20, 2015·Chemical Reviews·Zhibin YangHuisheng Peng
Apr 2, 2015·Proceedings of the National Academy of Sciences of the United States of America·Maher F El-KadyRichard B Kaner
Jan 27, 2015·Journal of Colloid and Interface Science·Chengzhi HuJiuhui Qu
Aug 9, 2016·Journal of Colloid and Interface Science·Lihu LiuGuohong Qiu
May 3, 2014·ACS Applied Materials & Interfaces·Ju-Won JeonSatish K Nune
Feb 18, 2014·Nano Letters·Brad L CorsoPhilip G Collins
Mar 8, 2018·Chemical Society Reviews·Xianglong Li, Linjie Zhi

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